MK2058-01 Datasheet, PDF (1/10 Pages) Integrated Circuit Systems – Communications Clock Jitter Attenuator

MK2058-01
Communications Clock Jitter Attenuator
Description
The MK2058-01 is a VCXO (Voltage Controlled Crystal
Oscillator) based clock jitter attenuator designed for
system clock distribution applications. This monolithic
IC, combined with an external inexpensive quartz
crystal, can be used to replace a more costly hybrid
VCXO retiming module. The device accepts and
outputs the same clock frequency in selectable ranges
covering 4kHz to 27MHz. A dual input mux is also
provided.
By controlling the VCXO frequency within a
phase-locked loop (PLL), the output clock is phase and
frequency locked to the input clock. Through selection
of external loop filter components, the PLL loop
bandwidth and damping factor can be tailored to meet
system clock requirements. A loop bandwidth down to
the Hz range is possible.
Features
• Excellent jitter attenuation for telecom clocks
• Also serves as a general purpose clock jitter
attenuator for distributed system clocks and
recovered data or video clocks
• 2:1 Input MUX for input reference clocks
• VCXO-based clock generation offers very low jitter
and phase noise generation
• Output clock is phase and frequency locked to the
selected input reference clock
• Fixed input to output phase relationship
• +115ppm minimum crystal frequency pullability
range, using recommended crystal
• Industrial temperature range
• Low power CMOS technology
• 20 pin SOIC package
• Single 3.3V power supply
Block Diagram
Input Clock ^ICLK2
1
Input Clock ^ICLK1
0
IS E L
3
SEL2:0
ISET
Phase
Detector
Charge
Pump
Pullable xtal
X1
X2
VDD
VDD 3
VCXO
Selectable
D iv id e r
CHGP
V IN
GND 4
CLK
MDS 2058-01 B
1
Revision 071001
Integrated Circuit Systems, Inc. q 525 Race Street, San Jose, CA 95126 q tel [phone] q www.icst.com